201230012021 has 4 divisors (see below), whose sum is σ = 201231067500. Its totient is φ = 201228956544.

The previous prime is 201230011981. The next prime is 201230012051. The reversal of 201230012021 is 120210032102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 94144648900 + 107085363121 = 306830^2 + 327239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201230012021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201230011987 and 201230012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201230012051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153116 + ... + 652613.

It is an arithmetic number, because the mean of its divisors is an integer number (50307766875).

Almost surely, 2^201230012021 is an apocalyptic number.

It is an amenable number.

201230012021 is a deficient number, since it is larger than the sum of its proper divisors (1055479).

201230012021 is an equidigital number, since it uses as much as digits as its factorization.

201230012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055478.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 201230012021 its reverse (120210032102), we get a palindrome (321440044123).

The spelling of 201230012021 in words is "two hundred one billion, two hundred thirty million, twelve thousand, twenty-one".